Are Ground fault indicator lights Required on a transformer Secondary if its ungrounded delta? I back fed a "y" to delta transformer to boost voltage from 240 3ph to 480 3ph. so now my delta primary is actually the secondary and I now have no grounding point. the AHJ says that since I have no grounded conductor there is no way to facilitate the overcurrent device if a phase ever goes to ground. he says that there could be voltage to ground which would be hazardous especially at 480v, and so he has instructed me to install a ground fault indicator device of some sort. I called my Dad who's a retired Navy electrician as well as a plant supervisor electrican. he said that these indicator light systems are used on every Navy ship and that he had seen them installed in the Lumber mill and fruit packing plants he worked in The problem is that the tech guys on Cutler Hammers tech line didnt have a clue what I was refering too. so they transfered me to a controls guy who emailed me a set of drawings using current sensing relays to turn on a light in a ground fault situation. then while researching phase converters i ran into the same thing, noticing that the secondary on a phase converter is ungrounded delta. the tech guy from the phase converter company said my AHJ was nuts. that ungrounded deltas are all over the place without this ground fault indicator thing.
any comments would be much appreciated especially if you have documentation to show my AHJ who by the way I highly respect.
any comments would be much appreciated especially if you have documentation to show my AHJ who by the way I highly respect.
